Hiro,
First connect up the board and get it working in stock condition and when all is
well and running look for mods that you may want to try.
I have posted the audio distortion fix just now. Its very simple to do.
Raj
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At 29-06-18, you wrote:
Hi, all.
Im really new to uBITX and planning to place my order to hfsignals.com very soon.
Then please share its known hardware issues of uBITX r4 that I need to modify or solder.
Thanks in advance and hope to QSO with my uBITX soon.
// hiro, JJ1FXF